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How far can a rafter span without support?

A rule of thumb is 1.5 times a joist’s depth but in feet when spaced at 16” centers. In general, a 2×8 will span 1.5 x 8, so 12-feet. Based on all factors though, a 2×8 joist span is 7′-1” to 16′-6”, and a rafter 6′-7” and 23′-9”.

How long can a 2×6 Rafter span?

A 2×6 spaced 16 inches apart can span a maximum distance of 13 feet 5 inches when used as a rafter, 10 feet 9 inches when used as a joist, and 6 feet 11 inches when used as a deck beam to support joists with a 6-foot span.

How far can a 2 by 8 Rafter span?

Max. Live Load 20 lbs/ft2 (956 N/m2)

Maximum Span (ft – in)
Nominal Size (inches) Rafter Spacing, Center to Center, OC (inches) Lumber Grade
2 x 8 12 21′ – 7”
16 19′ – 7”
24 17′

How far can a 4×8 Rafter span?

lists 14’6″ as the max allowable span for 4×8 rafter.

Can a 2X6 span 8 feet?

The maximum distance a 2×6 can span, according to the 2018 IRC, for a floor joist, is 12′-6”, ceiling joist 20′-8”, rafter 18′-0”, deck board 24”, deck joist 9′-11”, deck beam 8′-3”, and 6′-1” as for header.

How far can a double 2X10 span without support?

10 feet
A double ply beam can span in feet if there is no overhang beyond it. A double 2×12 beam can span 12 feet, a double 2×10 can span 10 feet, and so on.

How far can a 2×8 joist span without support?

12 feet
In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. A 2×8 up to 12 feet; 2×10 to 15 feet and 2×12 to 18 feet. The larger the deck, the larger the joists.

How far can a double 2×10 span without support?

How far can a 6×6 span without support?

What is the maximum span of a 6×6 beam? Each 6×6 beam only spans 12 feet, with 2 of those feet supported by a toggle. So technically, the rafters only extend 10 feet.

What size beam can span 20 feet?

For 20 foot span, size of continuous beam for 2-3 storey residential building, using thumb rule, is about 9″×12″ in which beam width is 9″ and beam depth is 12″ providing with 2nos of 12mm bar at top, 2nos of 16mm bar at bottom and 2nos of 12mm crank bar of Fe500 with stirrup [email protected]″C/C and M20 grade of concrete ratio (1 …

What is the standard spacing of a roof rafter 2×6?

The table states that 2 X 6 rafters spaced 16 inches on center (o.c) can span a maximum distance of 13 feet 5 inches . Another option are 2 X 8 rafters spaced 24 inches o.c.

What size should roof rafters be?

Rafters vary in size from house to house and the thickness of the rafters depends upon the pitch of the roof and the roof span. Standard rafters range in size from 2-by-4s to 2-by12s, with the larger rafters being used to span greater distances or lower-pitch roofs.

What size rafter do I Need?

The most common rafter spacing is 24 inches, and 5/8-inch plywood is recommended for that. It will support roof loads for most situations and is the standard for most roof applications. Roofs with very heavy loads may require 3/4-inch thickness.

What is standard size of a roof rafter?

Typical rafter-spacing codes will specify a minimum spacing of 16 inches, 19.2 inches or 24 inches. The closer the rafters are to each other, the stronger the roof will be. Some communities require that rafters be made of a specific wood type, such as fir, as opposed to pine or spruce, for added roof strength.